Screw-propeller



|. GARELA.

SCREW PROPELL-ER.

APPLICATION FILED OCT 11, 1920. v v '1 ,3qf?,27 W Patented May 10, 1921.

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I. GARELA.

SCREW PROPELLER.

APPLICAHON FILED OCT 11.1920.

137L827 Patented; May 10,1921.

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f far/"aka. @XW H WITNESS: MTQRNEIY IGN'AGI GAB/FLA, OF BROOKLYN, NEW YORK.

SCREW-PROPELLER.

Specification of Letters Patent.

Patented May 16, 1921'.

Application filed. October 11, 1920. Serial No. 118,019.

To all whom it may concern:

Be it known that l, IcNAoI GARELA, a citizen of Poland, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Screw-Propellers, of which the following is a specification.

This invention relates to propellers, particularly those of the screw type, and has for its object the provision of a propeller whlch includes two series of blades all having the same inclination, the series being concentrically arranged.

An important object is the provision of a propeller of this character including a central hub member, a ring concentric therewith, and blades disposed between the ring and the hub and other blades carried by the outside of the ring, novel means being provided for securing the blades in position.

An additional object is the provision of a propeller of this character which will be simple and inexpensive in manufacture, highly efficient and powerful in use, durable in service, and a general improvement in the art. I

With the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed and illustrated in the accompanying drawings 1n which- Figure 1 is an elevation of a propeller constructed in accordance with my invention,

Fig. 2 is a cross sectional View therethrough,

Fig. 3 is a side elevation,

Fig. i is a fragmentary perspective view of the ring alone,

Fig. 5 is a detail perspective view of one of the outer blades,

Fig. 6 is a perspective view of one of the inner blades, and

Fig. 7 is a detail sectional view.

Referring more particularly to the drawings, the numeral 10 designates the hub which is formed as cylindrical body'provided with a keyway 11 whereby it may be secured upon a shaft, not shown. The numeral 12 designates a ring which is concentric with the hub and which is provided with a plurality of transverse slots 13 and with holes 14 at the sides of the slots.

Disposed between the hub'lO and ring 12 is an inner series of blades 15 formed integrally upon the hub and given the proper twist so that they will exert a propelling action when the entire device is rotated. Each of these blades is formed at its outer end w th arcuate plates 16 which are formed with holes 17 adapted to register with the holes 14.

Carried by the ring 12 is an outer series of blades 18. The inner end of each blade 20 is formed with an integral plate portion 19 which is engaged against the outer pe riphery of the ring 12 and formed with holes 20 adapted to register with the holes 14; and 17 to receive rivets 21. Also formed on the plate portions 19 are ribs 22 fitting within the slots 13.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided a simply constructed and very powerful propeller which will possess the maximum efiiciency, which will utilize all the power imparted thereto, and which will efficiently perform all the functions for which it is intended.

While 1 have shown and described the preferred embodiment of my invention, it is of course to be understood that I reserve the right to make such changes in the form, construction, and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, it claim:

A propeller comprising a central hub, a ring concentric with said hub and provided with a series of slots and with holes at the sides of the slots, an inner series of blades between said hub and said ring and formed integrally upon the former, each blade being formed at its outer end with a plate provided with holes registering with said first named holes, and a plurality of blades carried by the ring and having their inner ends formed with plate portions engaging against the outer periphery thereof, said last named plate portions being formed with ribs fitting within said slots and being also formed with holes registering with said first and second named holes for the reception of securing members.

In testimony whereof I affix my signature.

IGNACI GARELA. 

